根据提供的DataFrame df回的下列问题

import pandas as pd
import numpy as np

img

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import pandas as pd
import numpy as np
data={
'AUD/USD': [1.72,1.74,np.nan,168,1.75,1.71,],
'EUR/AUD': [0.62,0.63,0.59,0.64,np.nan,0.61,],}
index = ['2022-10-1','2022-10-2','2022-10-3','2032-10-4','2022-10-7','2022-10-8']
df =pd.DataFrame(data,index)

sel_q1=['2022-10-1','2022-10-7']
q1=df.loc[sel_q1]
print(q1)

print('\n\n')

(start_q2,stop_q2)=(0,2)
q2=df.iloc[start_q2:stop_q2]
print(q2)

print('\n\n')

(start_q3,stop_q3)=(0,2)
q3=df[start_q3:stop_q3]
print(q3)

print('\n\n')

row_sel_q4=['2022-10-1','2022-10-2']
col_sel_q4=['AUD/USD']
q4=df.loc[row_sel_q4,col_sel_q4]
print(q4)
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